Merged branch 'issue-87'

+ Add animation for modules swaps
+ Add always / error callbacks to $.post requests
+ Remove usages of deprecated variables & functions
+ Format code, apply naming conventions

+ Font awesome icons
+ Split js code into functions
+ Improved appearance

- Complex report optimization
- Max rate calculation optimization

- Login filtering
- Complex enter key behaviour
- Process loading icon

*move selector to the center of navbar
*modify link to the selector
*add font icon

* Integration of drag-drop zone
* Some examples about new file structure